Balanced rotary valve



(o'Model.)

J. S. GLENN.

'BALANGED ROTARY VALVE. No. 335,188. Patented Febr-2, 1886.

IMIMM 4. I

a corresponding shoulder in the bore of casing A. Second. Before Iturned the valve B square on its lower or small end and seated it upon asquare shoulder in the casing, which did not prevent, however, the valveto wear sideward, therefore, for the purpose of better holding the valvein its concentric position with the bore of the casing, and forincreasing its bearing-surface at this point, I turn a chamfer, p, tothe end of the valve, which enters a corresponding socket formed in thecasing. Third. When the valve was constantly oscillated to open itsports only half, or less, such portions only of the bearing-surfaces ofthe casing or valve were apt to wear away which did overlap each other,whereby the edge of eachport of the valve produced a shoulder in thebore of the casing, and, vice versa, did the edge of each port or cavityof the casing produce a shoulder on the bearing-surface ofthe valve,which to prevent I now form or cut a recess or cavity, q, in the valvebetween each two ports, only leaving a marginal bearingstrip to eachside of a port circumferentially, of sufficient width that, even with apartial opening of the ports, will fully overlap the bearing-stripsbetween ports g and cavities h h in the casing, which are arranged andproportioned in conformity with such valve,and for the joint purpose.Fourth. Such bearingst-rips between a port and a cavity, formed in thevalve as well as in the casing, being narrow, the wide opening ofthevalve would be apt to allow steam or water to nd its way from a cavityin the valve to a cavity in the casing, and thus allow leakage,which toprevent I provide each cavity q of valve B,0r each cavity h h of casingA,with one or more intermediate narrow bearing-strips, r, that will cutoffsuch leaks. Fifth. For insuring a perfect balance ofthe valve fromall sides I form channels sin such valv for connecting each twodiametrically-oppo- "site cavities g in a manner that the pressure ofthe iluid or liquid in each two opposite cavities is counterbalanced orequalized, and for this purpose I cast into the valve B small tubes thatin crossing pass each other.

The operation of the Valve otherwise is the same as described in myformer patents.

IVhat I claim isl. The combination, with casing A, having ports g gand'cavities h L, of valve B, having ports z' i andj j and cavities q,substantially as described, for the purpose specified.

2. The combination, with conically-ebored casing A, having ports g g andcavities h h', of valve B, having shoulder 0, ports 'i i andj j, andcavities q, as described.

3. The combination, with casing A, having ports g g and cavities h h',and with valve B, having ports c jj andcavities q, of intermediatebearingstrips, o, in either casing A or Valve B, all substantially asand for the purpose described.

4. The combination, with conically-bored casing A, having portsg g and'cavitiesh h', of valve B, having chamfered end p, ports i fi and jj,and. cavities q, as described.

5. The combination, with casing A, of valve B, having ports 'i and j andcavities q, each pair of diametrically-,opposite cavities com-1nunicatingthrough channels s, all substantially as and for the purposeset forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN S. GLENN.

Witnesses:

RICHARD BEINBOLD, HOWARD HALLocK.

